Update pg requirement from ~> 1.0.0 to >= 1.0, < 1.2

Updates the requirements on [pg](https://bitbucket.org/ged/ruby-pg) to permit the latest version.
- [Changelog](https://bitbucket.org/ged/ruby-pg/src/master/History.rdoc)
- [Commits](https://bitbucket.org/ged/ruby-pg/commits/tag/v1.1.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>

pushmi_pullyu.gemspec

@@ -28,7 +28,7 @@ Gem::Specification.new do |spec|
   spec.add_runtime_dependency 'daemons', '~> 1.2', '>= 1.2.4'
   spec.add_runtime_dependency 'minitar', '~> 0.6'
   spec.add_runtime_dependency 'openstack', '~> 3.3', '>= 3.3.10'
-  spec.add_runtime_dependency 'pg', '~> 1.0.0'
+  spec.add_runtime_dependency 'pg', '>= 1.0', '< 1.2'
   spec.add_runtime_dependency 'rdf', '>= 1.99', '< 4.0'
   spec.add_runtime_dependency 'rdf-n3', '>= 1.99', '< 4.0'
   spec.add_runtime_dependency 'redis', '>= 3.3', '< 5.0'